3649420261 has 2 divisors, whose sum is σ = 3649420262. Its totient is φ = 3649420260.

The previous prime is 3649420237. The next prime is 3649420289. The reversal of 3649420261 is 1620249463.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3603600900 + 45819361 = 60030^2 + 6769^2 .

It is a cyclic number.

It is not a de Polignac number, because 3649420261 - 2⁹ = 3649419749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3649420261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3649429261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1824710130 + 1824710131.

It is an arithmetic number, because the mean of its divisors is an integer number (1824710131).

Almost surely, 2^3649420261 is an apocalyptic number.

It is an amenable number.

3649420261 is a deficient number, since it is larger than the sum of its proper divisors (1).

3649420261 is an equidigital number, since it uses as much as digits as its factorization.

3649420261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 3649420261 is about 60410.4317233373. The cubic root of 3649420261 is about 1539.6002027623.

The spelling of 3649420261 in words is "three billion, six hundred forty-nine million, four hundred twenty thousand, two hundred sixty-one".